AU6060690A

AU6060690A - A device for pressing a supply of clay to individual mouldings to be deposited in a moulding tray

Info

Publication number: AU6060690A
Application number: AU60606/90A
Authority: AU
Inventors: Rudy Peters
Original assignee: SNEEK HUBERT MASCHF
Current assignee: Beheermaatschappij De Boer Nijmegen BV
Priority date: 1989-07-10
Filing date: 1990-07-10
Publication date: 1991-02-06
Anticipated expiration: 2010-07-10
Also published as: WO1991000794A1; EP0408149A1; DE69001406D1; ES2040034T3; AU629382B2; NL8901771A; EP0408149B1; DE69001406T2; US5131831A

Description

Title: A device for pressing a supply of clay to individual mouldings to be deposited in a moulding tray.

The invention relates to a device for pressing a supply of clay to individual mouldings to be deposited in the side-by-side positioned moulding cavities of a moulding tray, said device having at least one extruding nozzle, with a depositing means mounted thereunder and comprising two cooperating, substantially vertically positioned conveyor belts, said nozzle being mounted at a distance above a support for the moulding tray to be loaded. Such a device is disclosed in NL-A-161832, whereas improved eπibodiments of the sams are disclosed in prior IXitch patent applications 8802565 en 8802567. Devices of this type are particularly suitable for fanning mouldings for bricks having the characteristic "hand mould structure".

In general large numbers of moulding trays are involved, which are inteπr ttently supplied to a loading station and each contain a large number, e.g. sixteen juxtaposed moulding cavities. Usually the extruding device comprises a number of presses with associated nozzles and depositing means, which number corresponds with half the number of moulding cavities per moulding tray.

For example, a press for loading moulding trays containing sixteen juxtaposed moulding cavities, comprises two rows of four presses, said rows extending transversally to the direction in which the moulding trays are supplied, the presses of one row being positioned laterally offset with respect to the presses in the other row through a distance which corresponds to the pitch of the moulding cavities, whereas the presses in each row are mutually spaced through a distance co_rresponding to twice the pitch of the moulding cavities in the moulding tray. Each press is supposed to load - one immediately after the other - two juxtaposed moulding cavities of each supplied moulding tray. For this purpose the respective press and the moulding tray must, after the first of said two juxtaposed moulding cavities being loaded, be displaced longitudinally relative to one another through a distance corresponding to the pitch of the moulding cavities. In the well-known systems used so far the extruding device is usually taking a stationary position and the moulding trays - after having received a first loading - are shifted in their longitudinal direction relative to the extruding device in order to receive the loading for the second moulding cavity. A disadvantage of such a system is, that the reciprocating movement of the moulding trays over guideways, which are usually covered with sand, is connected with rapid going abrasion processes, which may necessitate a frequent changing of moulding trays. As an alternative it has already been proposed to keep the moulding trays stationary within the filling station and to reciprocate the extruding device over a guiding means in the longitudinal direction of the moulding trays to be loaded, through a distance corresponding to the pitch of the moulding cavities. This means that each time a very heavy mass has to be accelerated and decelerated along a very short distance. According to the present invention an improved alternative is proposed, which is characterized in that the extruding device is mounted in a frame which is swingably suspended about an upper horizontal axis to a fixed supporting structure, drive means being provided by means of which a swinging motion about a mid position may be imparted to- the device, in such a way, that during each swinging period two successive mouldings may be deposited into two juxtaposed cavities of the stationary moulding tray, by each depositing means. Relatively heavy masses are involved here, which are rocking through a very small angle. Such a rocking or swinging movement, however, can be controlled far better than a rectilinearly reciprocating movement.

In a practical embodiment the drive means comprise an eccentric- connecting rod mechanism mounted to the swingable frame and to the stationary supporting structure respectively.

The invention will be hereinafter further described by way of example with reference to the drawing.

Fig. 1 is an elevatiαnal view as seen in the conveying direction of the moulding trays to be loaded and fig. 2 is a side view of the device of fig. 1. In the drawing the moulding trays to be loaded with lumps of clay are indicated at 1. In the exanple shewn the moulding trays each contain sixteen moulding cavities, which are marked a through p as seen from the left to the right in fig. 1.

The moulding trays or moulding tray supports respectively are e.g. swingably (about the longitudinal axis) mounted between the end walls of a conveyor drum which is mounted for rotation about a horizontal axis. The upper part of the motion path of this conveyor drum is indicated by the arc x.

In fig. 2 the four moulding trays 1 are each designating one of four successive positions or stations, in which the conveyor drum is cxsning to a standstill each time after carrying out a displacement step in the direction of the arrow y. As will appear hereinafter the loading with lumps of clay is taking place in the positions I and II.

The extruding device used in the example shown comprises two row A and B of four presses each, the drive motors of which are indicated at Al up to and including 4 and Bl to 4 respectively. C indicate the bunkers to which the clay is supplied which has to be worked to mouldings, whereas Dl to 4 and El to 4 designate the eight extruding nozzle units. Under each of the eight extruding nozzle units there is provided a depositing means F or G respectively, each of which consists of two vertically arranged endless conveyor belts, which are driven with the opposing runs moving downwardly. The drive means for these depositing means have been indicated at A and J respectively in fig. 1. As shown in fig. 2, the four depositing belts Fl to 4 are positioned vertically over a moulding tray within station I, while the depositing belts Gl to 4 are located vertically over the moulding tray within station IV.

The entire extruding device, comprising the individual presses A and B with the respective drive means Al to 4 and Bl to 4, the clay bunkers C, the extruding nozzle units Dl to 4 and El to 4, as well as the depositing belts Fl to 4 and Gl to 4 with the respective drive means are mounted within a frame K, which is swingably suspended, about a horizontal axis L, between lateral supports M of a stationary supporting structure, of which a gangway N is also making a part.

Fig. 1 shows the swingable frame with the extruding device in a mid position. This mid position corresponds with the mid position of the ecceπt ic -conneσting rod mechanism, indicated at 0, by means of which the movable frame may carry out a coπplete swinging motion each time during a period of standstill of the conveyor drum and the moulding trays carried thereby.

In the mid position of fig. 1 the depositing mouths of the depositing belts Fl to 4 are located over the partitions between the moulding cavities c and d or g and h or k and 1 or o and p respec- tively. The depositing belts Gl to 4, which are located behind the plane of drawing in fig. 1, are (in the mid position under consideration) located respectively over the partition between the moulding cavities a and b or e and f or i and j or m and n respectively. Consequently the depositing belts G are located offset relative to the depositing belts F through a distance corresponding to the pitch of the moulding cavities.

The various drive means are timed with respect to one another in such a way, that within each period of standstill of the conveyor drum the exeentric-cx_xr_nec£ing rod mechanism 0 is performing a complete swinging movement, during which each press produces two lumps of clay, which are successively ejected by the respective depositing belt. From the mid position in fig. 1 the movable frame K is first moving to the left, towards a position vertically over the moulding cavities c, g, k and o within station I and the moulding cavities a, e, i and within station IV respectively, and then - after each of the moulding cavities just referred to having received a lump of clay - to the right towards a position vertically over the moulding cavities d, h, 1 and p within station I and the moulding cavities b, f, j and n within station IV respectively, and finally, after the last mentioned cavities having also been loaded with lumps of clay, back to the said mid position, where it comes to a standstill. Thereafter the conveyor drum will perform a further displacement step. It will be clear, that in this way a moulding tray, which has received the first eight lumps of clay in εtiεtion I, will receive its second eight lumps of clay in station IV, which is three displacement steps later.

In the example shown and described hereinabσve a drum is used as a conveying means for the stepwise displacement of the moulding trays to be loaded. It will be understood however, that the device according to this invention is also applicable in a case, in which the moulding trays are"-displaced from station I to station IV along a straight path. -

Claims

CIAIMS 1. A device for pressing a supply of clay to individual mouldings to be deposited in the side-by-side positioned moulding cavities of a moulding tray, said device having at least one extruding nozzle, with a depositing means mounted thereunder and comprising two cooperating, substantially vertically positioned conveyor belts, said nozzle being mounted at a distance above a support for the moulding tray to be loaded, characterized in that the extruding device is mounted in a frame which is swingably suspended about an upper horizontal axis to a fixed supporting structure, drive neans being provided by means of which a swinging motion about a mid position may be imparted to the device, in such a way, that during each swinging period two successive mouldings may be deposited into two juxtaposed cavities of the stationary moulding tray, by each depositing means. 2. A device acxcrding to claim 1, characterized in that the drive means comprise an rod mechanism mounted to the swingable frame and to the stationay supporting structure respectively.